My Cox twin collection

Jason_WI Tue Oct 27, 2015 7:18 pm

Figured I'd take a pic of my Cox twin collection. Just added the TeePee .040 this week. The back 2 engines I have run. The others I have not run yet. Probably won't run the .040 since it looks unrun.

There was one other twin but it's a non running eBay mistake.

My Cox twin collection 20d482566fff8a52506399e33e24d90b_zpsc1itxkr9

My Cox twin collection 20d482566fff8a52506399e33e24d90b_zpsc1itxkr9

My Cox twin collection 43481ef6b52e6b14dd49602138b86339_zps6rm4nldq

crankbndr Tue Oct 27, 2015 7:29 pm

I followed that listing, when I saw it I thought of you Very Happy

Nice engine, looks well done and it had a box too?

Jason_WI Tue Oct 27, 2015 8:00 pm

Yes it had the box and instructions too. The bottom of the box was lined with a piece of newspaper dated from May 1968. So I assume it was made the latter half of '68 based on this.

My Cox twin collection 2841eb7f66d63746cdabe7435f5f8315_zpszti1hop7

My Cox twin collection 2841eb7f66d63746cdabe7435f5f8315_zpszti1hop7

My Cox twin collection 11a642866c31ad100b7b70ec259b2ff2_zps0emyscsy

garza2014 Tue Oct 27, 2015 8:01 pm

These engines are very beautiful, congratulations

Alejo

JPvelo Tue Oct 27, 2015 10:24 pm

Very very cool. I would love to see video of one of them running.

Jim

Jason_WI Tue Oct 27, 2015 10:51 pm

JPvelo wrote:Very very cool. I would love to see video of one of them running.

Jim

here is the twin golden bee running.

**Admin** Wed Oct 28, 2015 1:26 am

I was watching that Tee-Pee. Fine pieces of machining!

coxaddict Wed Oct 28, 2015 2:43 am

Hi, can you add your twins to your photo gallery?
Thanks
coxaddict

rsv1cox Wed Oct 28, 2015 6:04 am

Nice Jason, thanks for sharing, I love this stuff. Collections are educational and fun to do. I just added blue and yellow tanked SBJ's to mine.

Bob

getback Wed Oct 28, 2015 7:01 am

NICE Collection Jason !! I new you had some twins but had no idea you were that deep into it , good stuff , That's a beautiful engine and very nice with paper work and box , I was also watching it had no idea it was from 1968 that's cool ! Do you know if the company or gentleman is still with us ? Eric Small Cox Logo

rsv1cox Wed Oct 28, 2015 11:33 am

Jason_WI wrote:
JPvelo wrote:Very very cool. I would love to see video of one of them running.

Jim

here is the twin golden bee running.

Just curious. What fuel are you using? What prop? Do you leave the batteries attached while running? Do they both start together? What happens if one just windmills? I would think that they would both have to start together because of the gearing. Is there a practical application for model use, or are they just bench run only? I would think that bulk and weight would offset any power gain.

They don't sound like the two Golden Bees on my P-38 when they sync together, perhaps that's because they are mechanically attached.

Bob

Mark Boesen Wed Oct 28, 2015 11:26 pm

Two .049 make less power than a typical .10 and are considerably heavier, but not nearly as cool!!!! Nice collection!

It seemed like these were really popular early 70's thru the 80's, i remember seeing ads in model airplane mags a lot, also geared .60's were big at this time, the dawn of 1/4 scale.

Oldenginerod Thu Oct 29, 2015 1:51 am

Jason_WI wrote:
JPvelo wrote:Very very cool. I would love to see video of one of them running.

Jim

here is the twin golden bee running.

That second engine sure becomes a liability once it cuts out. What concerned me was that the remaining runner just got slower & slower. All I can think was that the one that cut out was running with no lube and started to tighten up. I'd be curious to know what the engine speed is with the 12,000 rpm prop speed, or is the gearing 1:1?

Jason_WI Thu Oct 29, 2015 8:12 pm

rsv1cox wrote:

Just curious. What fuel are you using? What prop? Do you leave the batteries attached while running? Do they both start together? What happens if one just windmills? I would think that they would both have to start together because of the gearing. Is there a practical application for model use, or are they just bench run only? I would think that bulk and weight would offset any power gain.

They don't sound like the two Golden Bees on my P-38 when they sync together, perhaps that's because they are mechanically attached.

Bob

Using a MA 7x4 prop and Sig Champion 25%. Its in the comments for the vid if you view it at the youtube site. Not sure why I left the glow plug clips on. It does run once they are removed.

The gearing is not 1:1. It does have reduction. The engines are timed so they fire at the same time so you dont get the harmonics like a normal twin plane with 2 seperate engines.

This would look good in a small cub.

**Cribbs74** Fri Oct 30, 2015 6:19 pm

They look to run very smoothly. Are those GB's stock?

Jason_WI Sat Oct 31, 2015 1:29 am

Cribbs74 wrote:They look to run very smoothly. Are those GB's stock?

Yes. In fact when I got it it had a very early pinkish hue GB on it with the 3 piece piston. I removed that engine and replaced with a later version.

jsesere Sun Nov 01, 2015 1:31 am

Nice TeePee Jason. The seller (gatafish) sells lots of nice engines. I wonder if he's a long time hoarder cashing in on his retirement fund or does he spend a lot of time going to swap meets?

cox24711 Sun Nov 01, 2015 4:21 am

what gearing do they have?

happydad Mon Feb 22, 2016 7:47 pm

Jason_WI wrote:Figured I'd take a pic of my Cox twin collection. Just added the TeePee .040 this week. The back 2 engines I have run. The others I have not run yet. Probably won't run the .040 since it looks unrun.

There was one other twin but it's a non running eBay mistake.

Jason: You might be interested in adding this "Cox Twin". lol!

, to your collection. And get a free space bug jr..
link:http://www.ebay.com/itm/COX-PRO-ROD-VINTAGE-MINT-TWIN-CYLINDER-AND-ORIGINAL-ENGINE-/371548464953?hash=item568203a739:g:S4IAAOSwFMZWtSzX

My Cox twin collection Coxpro10

looks like the real thing doesn't it? NOT lol!

space bug jr. included free

p.s. all this for only $375 + $17.39 shipping

happydad RC Plane

cox24711 Tue Feb 23, 2016 12:31 am

if i would make a geared twin are there any other gears that I could use?

pkrankow Tue Feb 23, 2016 7:50 am

cox24711 wrote:if i would make a geared twin are there any other gears that I could use?

https://www.coxengineforum.com/t1623-cox-geared-twins

There are some links in this thread to a rather complete looking set of instructions. It is tempting to try. I am sure there are "local" supply houses* that carry gears that are suitable anywhere in the world.

Phil

*I count mail/internet order from the same country as "local" for this purpose.

happydad Sat Mar 05, 2016 11:53 pm

Well it's been a while since we have seen any "new" cox twins. This one is new to me. Build it to order 2 weeks ARO.

link:
http://www.ebay.com/itm/Cox-049-Based-V-Twin-049-Radial-Engine-Motor-Cox-V-Twin-Prototype-COOL-/291698662068?hash=item43ea985ab4:g:Fa4AAOSw~OVWxIvS

My Cox twin collection Coxvtw10

Cox V-twin on ebay $200 for a build to order

see u-tube video

link: https://www.youtube.com/watch?v=NRoTPDdFMHw&feature=youtu.be

happydad RC Plane

Oldenginerod Sun Mar 06, 2016 12:15 am

happydad wrote:Well it's been a while since we have seen any "new" cox twins. This one is new to me. Build it to order 2 weeks ARO.

link:
http://www.ebay.com/itm/Cox-049-Based-V-Twin-049-Radial-Engine-Motor-Cox-V-Twin-Prototype-COOL-/291698662068?hash=item43ea985ab4:g:Fa4AAOSw~OVWxIvS

Cox V-twin on ebay $200 for a build to order

see u-tube video

link: https://www.youtube.com/watch?v=NRoTPDdFMHw&feature=youtu.be

happydad

After stating "Both cylinders run" it's a little odd that he then states "This engine is sold "as is" for display purposes only."

1/2A Nut Sun Mar 06, 2016 5:29 am

Having the intake in the rear the front cylinder starves, the lions share of fuel going to the rear cylinder.
The front cylinder will act like a slave. The lag will wear out parts faster.

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My Cox twin collection

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what gearing do they have?

Another Cox Twin Engine on a Prop Rod

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here is another one! V-twin BTO

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